/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * This file is part of retabel.
 *
 * Copyright (c) 2011 by individual contributors as indicated by the
 * @author tags. See the copyright.txt file in the distribution
 * for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.retabel.util;

import org.xml.sax.SAXException;

import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import java.io.InputStream;
import java.net.URL;

/**
 * Class providing Jaxb utility functions
 * <p/>
 * <h3>Extra-Info</h3>
 * Created: 20:56 06.09.11
 *
 * @author Peter Herber
 * @version 1.0
 */
public class JaxbUtils {

    public static <T> T unmarshal(URL xsdSchemaURL, InputStream inputStream, Class<T> clazz) throws JAXBException, SAXException {
        SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
        Schema schema = xsdSchemaURL != null ? schemaFactory.newSchema(xsdSchemaURL) : null;
        JAXBContext jaxbContext = JAXBContext.newInstance(clazz.getPackage().getName());
        return unmarshal(jaxbContext, schema, inputStream, clazz);
    }

    @SuppressWarnings({"unchecked"})
    public static <T> T unmarshal(JAXBContext jaxbContext, Schema schema, InputStream inputStream, Class<T> clazz)
        throws JAXBException {
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        unmarshaller.setSchema(schema);
        return ((JAXBElement<T>) unmarshaller.unmarshal(inputStream)).getValue();
    }


}
